while (stack.length 0 && nums[stack[stack.length - 1]] <= curHeight) {
Instead, it focuses on explicit boundaries, predictable behavior,
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2月26日，湖北省孝感市云梦田律农事综合服务中心智能化育秧室，员工们在忙着选种、育秧，为春耕春种做准备。图为中心员工在查看培育的秧苗。
Real-mode programs freely execute CLI and STI to control interrupts, PUSHF and POPF to manipulate flags, INT n for DOS and BIOS calls, and IN/OUT for hardware I/O. In normal protected mode, these instructions are privilege-checked -- they execute normally if the caller has sufficient privilege, and fault otherwise. The 386 can't simply let V86 tasks execute them freely -- a DOS program disabling interrupts would bring down the whole system -- but trapping on every INT 21h call would make V86 impractically slow.